you shop. a diaper price survey -- it shopped for diapers in warehouse stores, discounters, online. one of the biggest surprises -- shop amazon. for a monthly fee, you can join amazon mom and save find big- name diapers. >> the prices were far lower than any store where we shopped. >> also notable, some of the best prices on diapers were at costco, target, sam's club, and bj's. buying a box of diapers with more than 120 diapers will likely say you anywhere from 15% to 20%. when it comes to cloth diapers, they are most efficient when you watch them yourself. >> and that is fun. >> remember those days.